Designed to inflate or deflate your inflatables faster, and with less effort. Due to its continuous stream of output on both the up and down strokes, this pump easily fills up your inflatables to the brim, with ease. Besides filling up your stuff solely with the LP1, some towables recommend using a hand or foot-pump to top off your items after being inflated with electric pumps. That way you don't over-fill any of your inflatables, thus saving money!